Educational, research-use-only content. This article summarizes published scientific literature for informational purposes only and is not medical advice. The compounds discussed are supplied strictly for in-vitro laboratory research and are not approved for human or veterinary use.
What is LL-37?
LL-37 is the active form of the only human cathelicidin — a naturally occurring antimicrobial peptide that is a component of the innate immune system. It is studied for its roles in host defense, antimicrobial activity, and immune signaling.
What the research examined
Cathelicidin features prominently in innate-immunity research. A high-profile study showed that, in response to bacterial lipopolysaccharide, host-defense proteins including the antimicrobial cathelicidin assemble on cellular lipid droplets, which act as innate immune hubs that help kill intracellular pathogens while coordinating metabolic adaptation to infection (Bosch et al., 2020).
How it is thought to work
As a cationic, amphipathic peptide, LL-37 can disrupt microbial membranes and also modulate immune-cell behavior and inflammatory signaling — which is why it is studied in both antimicrobial and immunomodulatory contexts (Bosch et al., 2020).
The limits of the current evidence
- Much of the work is mechanistic and cell- or animal-based; therapeutic applications remain investigational.
- LL-37 is not an approved medicine; this material is supplied for laboratory research use only.
References
According to PubMed:
- Bosch M, et al. Mammalian lipid droplets are innate immune hubs integrating cell metabolism and host defense. Science. 2020. doi:10.1126/science.aay8085
